Buggy code:
final void setVisibleActionImpl ( boolean visible ) { } private class VisibleAction implements Runnable { boolean visible ; private VisibleAction ( boolean visible ) { } public final void run ( ) { } } public void setVisible ( boolean visible ) { } final void setSizeActionImpl ( int width , int height ) { } private class SetSizeAction implements Runnable { int width ; int height ; private SetSizeAction ( int w , int h ) { } public final void run ( ) { } } public void setSize ( int width , int height ) { } public void setTopLevelSize ( int width , int height ) { } private class DestroyAction implements Runnable { public final void run ( ) { } } public void destroy ( ) { } protected static boolean isOffscreenInstance ( NativeWindow cWin , NativeWindow pWin ) { } private class ReparentActionImpl implements Runnable , ReparentAction { NativeWindow newParentWindow ; boolean forceDestroyCreate ; int reparentAction ; private ReparentActionImpl ( NativeWindow newParentWindow , boolean forceDestroyCreate ) { } private int getStrategy ( ) { } private void setScreen ( ScreenImpl newScreen ) { } public final void run ( ) { } private void reparent ( ) { } } private class ReparentActionRecreate implements Runnable { public final void run ( ) { } } public final int reparentWindow ( NativeWindow newParent ) { } public int reparentWindow ( NativeWindow newParent , boolean forceDestroyCreate ) { } public CapabilitiesChooser setCapabilitiesChooser ( CapabilitiesChooser chooser ) { } public final CapabilitiesImmutable getChosenCapabilities ( ) { } public final CapabilitiesImmutable getRequestedCapabilities ( ) { } private class DecorationActionImpl implements Runnable { boolean undecorated ; private DecorationActionImpl ( boolean undecorated ) { } public final void run ( ) { } } public void setUndecorated ( boolean value ) { } public final boolean isUndecorated ( ) { } private class AlwaysOnTopActionImpl implements Runnable { boolean alwaysOnTop ; private AlwaysOnTopActionImpl ( boolean undecorated ) { } public final void run ( ) { } } public final void setAlwaysOnTop ( boolean value ) { } public final boolean isAlwaysOnTop ( ) { } public String getTitle ( ) { } public void setTitle ( String title ) { } public boolean isPointerVisible ( ) { } public void setPointerVisible ( boolean pointerVisible ) { } public boolean isPointerConfined ( ) { } public void confinePointer ( boolean confine ) { } public void warpPointer ( int x , int y ) { } public final InsetsImmutable getInsets ( ) { } public final int getWidth ( ) { } public final int getHeight ( ) { } public final int getX ( ) { } public final int getY ( ) { } public final boolean isVisible ( ) { } public final boolean isFullscreen ( ) { } public boolean hasDeviceChanged ( ) { } public WindowImpl . LifecycleHook getLifecycleHook ( ) { } public WindowImpl . LifecycleHook setLifecycleHook ( WindowImpl . LifecycleHook hook ) { } public Object getWrappedWindow ( ) { } public final Window getDelegatedWindow ( ) { } public void setHandleDestroyNotify ( boolean b ) { } public final AbstractGraphicsConfiguration getPrivateGraphicsConfiguration ( ) { } protected final long getParentWindowHandle ( ) { } @ Override public String toString ( ) { } protected final void setWindowHandle ( long handle ) { } public void runOnEDTIfAvail ( boolean wait , final Runnable task ) { } private class RequestFocusAction implements Runnable { public final void run ( ) { } } public final boolean hasFocus ( ) { } public void requestFocus ( ) { } public void requestFocus ( boolean wait ) { <START_BUG> if ( ! ( focusAction ( ) ) ) { <END_BUG> runOnEDTIfAvail ( wait , requestFocusAction ) ; } } private void requestFocusInt ( boolean force ) { } public void setFocusAction ( FocusRunnable focusAction ) { } private boolean focusAction ( ) { } public void setKeyboardFocusHandler ( KeyListener l ) { } private class SetPositionActionImpl implements Runnable { int x ; int y ; private SetPositionActionImpl ( int x , int y ) { } public final void run ( ) { } } public void setPosition ( int x , int y ) { } public void setTopLevelPosition ( int x , int y ) { } private class FullScreenActionImpl implements Runnable { boolean fullscreen ; private FullScreenActionImpl ( boolean fullscreen ) { } public final void run ( ) { } } public boolean setFullscreen ( boolean fullscreen ) { } private class ScreenModeListenerImpl implements ScreenModeListener { boolean animatorPaused = false ; public void screenModeChangeNotify ( ScreenMode sm ) { } public void screenModeChanged ( ScreenMode sm , boolean success ) { } } public final boolean removeChild ( NativeWindow win ) { } public final boolean addChild ( NativeWindow win ) { } private void doEvent ( boolean enqueue , boolean wait , NEWTEvent event ) { } public void enqueueEvent ( boolean wait , NEWTEvent event ) { } public boolean consumeEvent ( NEWTEvent e ) { } public void addSurfaceUpdatedListener ( SurfaceUpdatedListener l ) { } public void addSurfaceUpdatedListener ( int index , SurfaceUpdatedListener l ) throws IndexOutOfBoundsException { } public void removeSurfaceUpdatedListener ( SurfaceUpdatedListener l ) { } public void surfaceUpdated ( Object updater , NativeSurface ns , long when ) { } public void sendMouseEvent ( int eventType , int modifiers , int x , int y , int button , int rotation ) { } public void enqueueMouseEvent ( boolean wait , int eventType , int modifiers , int x , int y , int button , int rotation ) { } private void doMouseEvent ( boolean enqueue , boolean wait , int eventType , int modifiers , int x , int y , int button , int rotation ) { } public void addMouseListener ( MouseListener l ) { } public void addMouseListener ( int index , MouseListener l ) { }

Fix:
if ( ( isNativeValid ( ) ) && ( ! ( focusAction ( ) ) ) ) {